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Groovy: A powerful, dynamic language for the JVM
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.codehaus.groovy.runtime.typehandling;
public class GroovyCastException extends ClassCastException {
/**
* @param objectToCast object we tried to cast
* @param classToCastTo class we tried to cast to
* @param cause not kept but we pass on message from this Exception if any
*/
public GroovyCastException(Object objectToCast, Class classToCastTo, Exception cause) {
super(makeMessage(objectToCast,classToCastTo) + " due to: " +
cause.getClass().getName() + (cause.getMessage() == null ? "" : ": " + cause.getMessage()));
}
/**
* @param objectToCast object we tried to cast
* @param classToCastTo class we tried to cast to
*/
public GroovyCastException(Object objectToCast, Class classToCastTo) {
super(makeMessage(objectToCast,classToCastTo));
}
/**
* @param message custom Exception message
*/
public GroovyCastException(String message) {
super(message);
}
private static String makeMessage(Object objectToCast, Class classToCastTo) {
String classToCastFrom;
Object msgObject = objectToCast;
if (objectToCast!=null) {
classToCastFrom = objectToCast.getClass().getName();
} else {
msgObject = "null";
classToCastFrom = "null";
}
String msg =
"Cannot cast object '" + msgObject + "' " +
"with class '" + classToCastFrom + "' " +
"to class '" + classToCastTo.getName() + "'";
if (objectToCast==null){
msg += getWrapper(classToCastTo);
}
return msg;
}
private static String getWrapper(Class cls) {
Class ncls = cls;
if (cls==byte.class) {ncls=Byte.class;}
else if (cls==short.class) {ncls=Short.class;}
else if (cls==char.class) {ncls=Character.class;}
else if (cls==int.class) {ncls=Integer.class;}
else if (cls==long.class) {ncls=Long.class;}
else if (cls==float.class) {ncls=Float.class;}
else if (cls==double.class) {ncls=Double.class;}
if (cls!=null && ncls!=cls) {
String msg = ". Try '" + ncls.getName() + "' instead";
return msg;
}
return "";
}
}